High-speed free-chain hoist



f July 6, 1926.

F. w. col-'FING HIGH SPEED FREE CHAIN HolsT 2 sneetsv-shet 1 Fild July22, 1924 ATTORN YS July' 6 1926. lv-Sglg i F. w. COFFING;

-IIGljl SPEED FREE CHAIN HOISSIl Filed July' 22, 1924 2 sheets-sheet 2IN VEN TOR ATTORNEYS Patented July 6,1926.

UNITED 'STATES PATENTOFFICE.

FREDBIGK W. COFFING, 0F DANVILLE, ILLINOIS, ASSIGNOR TO OTTO WALTER, l

' PERRYSVILLE, INDIANA.

HIGH-SPEED rana-cnam no Isfr.

implication mea July 22, 1924. `serial 110. 727,527.

This invention relates to a high speed free chain hoist, and the objectlof this invention isr to provide a lightweight and high speed ,hoistwhich may be readily and conveniently A still. further object is toprovide a hoist of this character wherein a highdegree of power isapplied to the chain and wherein the chain may be held in any position-or adjustment and conveniently controlled irrespective of whether it isbeing payed outof or drawn into the housing.

A still further object is to provide a chain hoist having theseadvantages and which-'is of` simple and durable construction, reliablein operation, easy and convenient to control Vso and comparativelyinexpensive to manufac ture.

Other objects and .advantages of the invention'reside in certain novellfeatures of the construction, combination, and arrangement of partswhich will-be hereinafter more fully described and`particularly pointedout in the appended claims, reference being had to the accompanyingdrawings forming part of this specification, and in which: f

.Figure 1 is a view in side elevation with parts broken'away and shownin section and illustrating one vembodiment ofthe invention ' Figure 2is aview 'in section on line 2 2v of F1 ure 1, the chain being omittedand parts eing shown in elevation' for the sake of illustration; Y

Figure 3 is a fragmentary view in section l on line 3-3 of Figure 2;.

Aso

- of illustrations; l l

Figure 5 1s a vlew 1n elevation, showing- Figure 4 is a view of the handcrank and assoclated parts in side elevation, a portion of the handcranklbeingbroken away and parts being shown in section for 'the lsakethe inner lside of lthe handle;

Figure 6 is a detail v1ew,'show1ng the rerlease mechanism for thelocking pavvl;

' and Figure 7 is a view, partly in section and' .partly in elevation,showing the swivel connection ofthe hook to the chain;

Figure 8 is a view in horizontal section on line 8 8 of Figure 1; and

Figure 9 is a similar view on line 9-'9 of Figure 1.

Referring to the drawings, the numeral 10 designates generally thehousing' or casing c hain which is designated at 15. The lateral extentof the magazine is such as to permit tive to the walls 11 of thehousingbut these links are constrained to movement in .the

peripheral lflanges 12` secured to.

the links of the chain to freely move rela-y plane of the housing Thisvpermits the chain. to be readil moved into the. housing or to bereadily 1 ithdrawn therefrom withyout danger of its links becomingentangled y with each other ory with surrounding objects. A gearcasing16 is integrally formed with the parts of the housing and in the sidewalls of the gear casing a shaft 17 is rotatably mounted. A sprocketwheel 18 is keyed or otherwisexed' to the shaft 17 and its teeth whichengage the links of the chain 15 4oper-u ate in proximity to a Wall 19of the gear casing 16, the Wal1.19'providing"ja guide or track for thechain 15 while the same is being moved into the magazine'14 or beingpaid out yof the same by the sprocket wheel'18.

'A` hand crank 20, which constitutes an I has a hub 21 rotatably fittedon one end of the shaft 17, and held against axial displacement by meansof a screw 22 and Washer 23 by means of the engagement of the flange 24of the'hub with elements to be later described. A ratchet wheel 25 isfixed to the shaft 17 and/in the'assembly is locatedv within the flange24 of the hub of the hand lever 2.0. This ratchet wheel has teeth pro-,i

vided with inclinedand vertical faces. A ',105

pawl 26 is pivcally mounted, as at 27, on

the handle20 and is controlled by an angu-A lar and pivoted finger`piece 28 pivotally mounted on the handle andnconnected b a;

rod 29 with a lugBO integral the hub of the sprocket of the pawl 26. Thepawl 26v and ratchet wheel provides a pawl and ratchet connection' orvmore generally a one-way driv- -ing\.connection between the hand crankor operating element and the Shaft. The hand lever 20 is of channel formso .as to house the rod 29 and similar parts. A s ring 31 is providedand coacts with the ange of the handle 20 and with the pawl 26 to urgethe pawl into engagement with theteethv of the ratchet wheel 25. Withthis arrangement when the hand crank or hand lever 2O is rotated in onedirection it will impart.

be rotated in a clockwise direction, as viewed` '1n Flgure 1 so as topull the chain 15 into the magazine 14 of the housing.

In order to control the reverse rotation of the sprocket wheel 18 thatis the rotation in a counterclockwise direction as viewed in Figure 1, alocking pawl is providedand is pivotally mounted, as at 36, Vwithin`thegear casin 16. The outer end of this pawl is engagea le with theteeth ofthe sprocket 18 to hold the sprocket against reverse rotation and aspring 37 is provided for urging the outer end of the pawl 35 intoengagement with the teeth of s he sprocket 18 for this purpose. I Y

AReleasing mechanism is provided for the locking pawl 35 and thisreleasing mechanism 1s preferably controlled'from the hand crank 2O aswill presently be described. It will be notedl that the pawl 35 isprovided with a cammingsurface 38with which the teeth of the sprocket 18coact to throw the pawl 35 out of engagement with the teeth when thesprocket 18 is being rotated to draw the chain 15 into the housing. Oneside of the outer end of the locking pawl 35 is formed with an outwardlyextending and laterally offset lip 39 which is disposed out of the planeof the teeth of the sprocket 18 and which coacts with a lug 40integrally formed with or otherwise-rigidly secured to .an oscillatablecontrol late 41. This control plate 41 is dispose to one side ofthe gearcasing 16 and is mounted for limited rotation on the shaft 17 The lug 40projects laterally from the plate 41 and operates in an arcuate opening42 formed in the gear casing. In one position in the opening 42 the lug40 en ages the lip 39 and holds the pawl 35 o ut o engagement with theteeth )18 as shown in Fig. 3. In its other position in the opening 42the lug 40 is out of the eld of movement of pawl 35 sprin plate 41 andthe lug 40 anddoes not interfere with the engagement of this pawl withthe teeth of the sprocket 44 encircles the shaft 17 16 and the plate l4118. A coil spring between the gear casing ad one end of the spring gearcasing while the' other end is secured to the plate 41 by being wrappedaround or 44 is secured to the otherwise connected to the lug 42. This44 is of the tortional type and is tenso that it tends to move thecontrol to such position in the opening 42 that the lug 40 will engagethe lip 39 of the pawl `35 and hold vthe pawl 35 out of engagement withthe teeth of the sprocket 18. Thus whenever a tooth o f the sprocket 18coacts with the camming surface 38 of 4the pawl 35 to throw the pawl 35away from'the teeth 18,;"the spring 44`efl`ects a quick rotation of theplate 41 to bring the lug-40 into engagement with the lip 39 of the pawlto hold the pawl out of engagemei with the teeth of the sprocket.

e formed with teeth 45 having inclined and vertical faces, and withthese teeth 45 a pawl 46,'pivotal'ly connected, as at 47 ,l to the handcrank 20, co'acts. A spring 48 urges the pawl sione '46 into engagementwith the teeth 45 of the control plate 41. This pawl 46 may bedisengaged from the teeth 45 by gripping the handle member 20a of thehand crank since an operating member 50 forthe pawl 46 has an oset endA51 pivotally connected, as at,

periphery of the control plate 41 is crank 20 be released during thetime the A chain is being drawn into the magazine 14'of the housing 10,the chain will not freely pay out even though a heavy load be appliedthereto for as soon as out of the housing thel shaft 17 will be rotatedandthe hand crank 20 will be reverselyrotated with the shaft 17. Thismovement of the hand crank 20 causes the pawl 46 to the chain starts topull turn the controll plate 41 so as to disengage l the lug 40 from thelip 39 Yof )the pawl 35' whereupon the spring 37 at bnce forces the pawl35 into engagement with the teethv of the sprocket to lock the sameagainst reverse movement.

' it is only necessary to grip `the handle member 20a of the crank 20while the hand crank is reversely rotated for such gripping of thehandle lmember will depress the operating member 50 nso as to dis teeth45 of the engage the pawl 46frcm.

control plate 41"and permit the lug 40 to engage the lip 39 andtoholdthe locking pawl 35 out of engagement with the teeth of the sprocket1S. v

If it is desired to permit v the chain to'pay out in order to limit themovement of the; control plate 41 andfj'also the movement ofthehandprank in theY reverse direction to the extent necessary'torelease the p'awlv a fixed ratchet wheel 55 is secured to the gearcasing 16. This ratchet wheel y55 is' of annular form and a guide flange56 integrally formed with the plate 41 coactswith the opening of thisannular ratchet wheel 55 to constrain the plate 41 to proper -movement..The ratchet /wheel 55 has substantially the saine circular measurementsas the plate 4l although the ratchet wheel 45 is somewhat heavier in itsconstruction. 15l

The pawl 46 is of suiiicient width to coact with the ratchet Wheel 55 as`well as with the -teeth ofthe plate 41. The teeth of the ratchet wheelare spaced a sufficient distance from eachl othery about the peripheryAof the wheel 55 to permit the pawl 46 to actuate lthe release plate 41before it engages any teeth on the ratchet wheel 55. vIn assembly theteeth '45 are staggered with respect to the teeth of the wheel 55 asclearly shown in Figure 4l andthe pawl V46 is normally engaged withthese teeth 45 and does not en gage t-he teeth ofthe ratchet wheel 55until the plate 41 has been moved to such position as to release thepawl 35.

A hook is swivelly connected to the housing 10 by means of an enlargedhead 61 rotatably fitted in a socket 62 provided on the housing 10. Thehead presents a shoulder 63 which engages with a wall of the socket 62to prevent the hook from being pulled from the socket. It will nowbeunderstood that there is provided in this manner a pivotal mounting Aforthejhousing and it is proposed to provide also means for locking saidhousing in apredetermined position upon said pivotal mounting. For thislatter purpose the head 61 has afplurality of slots 65 formedV in itsperiphery, four` slots yat angular intervals of 90 pref-L erably beingprovided. A latch 66 is ypivotally mounted on the' housing 10, as indi'-cated at 67, the housing being recessed to permit thel latch tol partakeof its operative movements.` This latch 66 is selectivelyenageable withthe slots 65 of the head 61 to ook the housing in a predeterminedposition upon its pivotal mounting. A spring 68 is provided for urgingthe latch into engagement with the slots of the head. Of course thelatch may be manually released when it is desirable for the housing topiv' ot or swivel on its support.

A hook 70 .is swivelly connected to the chain 15.

The'chain hoist which constitutes the resent invention may be readily'carried rom place to place and may be suspended from any suitablesupport by the hook 60. The hook 70 may be readily connected to theobject to be elevated or to be pu1led.

A powerfulpull may be imparted to the chain 15 by rotating the handcrank 20 and nected to the hook 6 1 may be readily lowered or paidoutlay moving the hand crank 20 in a' direction to pull the, loadupwardly a slight'dist'ance and then permit the hand crank to move in areverse direction while gripping the handle member 2Oa thereofso as toswing the operating member 51 about its pivot 52 to provide for theaction herein above described., The chain when drawn into the housingcoils itself inthe magazine thereof and is not liableto becomeentangled. At the saine time the chain readily pays'out. Before grippingthe handle member 20a and reversely rotating the same it may benecessary to rotate the same forwardly to a slight extent that is in adirection such as to throw the pawl 35 to disengaged position.

I claim:

1. In a chain hoist, a housing having spaced walls defining a magazine,said housing also having a guide leading into the magazine, a chainextending through` the guide into the magazine, and means coacting of apair of similar parts having curved outlined and substantially flat sidewalls and offset parallel flanges secured together, the side walls andthe peripheral flanges of the .housing defining a magazine, the housingalso having a guide leading into the magazine, a chain extending throughthe guide into the magazine and means coacting with thechain for`drawing Athe saine into the magazine or controlling the paying outthereof, the side walls and the flanges of the housing coacting with thechain to cause the same to automatically and nonentanglingly arrangeitself when drawn into the housing.

3. In a chain hoist, a shaft, a sprocket wheel fixed to the shaft, acompletely rotatable and reversible hand crank having` a pawl andratchet connection with the shaft for rotating the same in onedirection, and means independent of the pawl and controllable from thehand crank for preventing reverse movement of the sprocket wheel.

4. In a. chain hoist, a. shaft, a sprocket wheel fixed to the shaft, ahand crank having apawl and ratchet connection with the shaft forrotatin the same in one direction, means controllab e from the handcrank for preventing reverse movement of the sprock-l liu4 et wheel andincluding aY locking pawl cooperable with the sprocket Wheel forprieventin'g reversemovement thereof, said lock- 1 ving pawl having acamming surface vwith 5' 7whichrfthe teeth of the sprocket coact tothrow/fthe locking pawl away from the sprocket when the sprocket`islbeing vrotated forwardly, aspring actuated control plate having. a.lng engageable Iwith the locking lpawl to hold the same disengagedandmeans carried by the hand crank'l and cooperable with the control platefor 'shifting the-same so as to disengage theL lug from' the locking-paWl "when the hand crank is reversely ro- 5. In a chain ghoist, 'ashaft, a sprocket Wheel fixed to the shaft, a hand crank having a-pavvl' and ratchet 'connection with the shaft for rotating the sameinone direction,

a locking pavvl cooperable with the sprocket Wheel .for preventingreverse` movement thereof, said locking paw] having a camming surfacewith which the teeth of. the sprocket coact t-o throw theqlocking pawlawayu from the sprocket when Athe latter is being rotated forwardly, aspring-actuated control plate having a lug cooperable with thejlockingpawl to hold the same disengaged, said control plate having peripheralratchet teeth, aI pawl carried'by the hand crank and cooperable with theteeth of the controlv plate, -a spring for urging thefpawl intoengagement with the teeth 'of the control plate, manually operable meanscarried by vthe hand crank -for disengagingthe pawl from the controlplate, and a fixed ratchet connected to the housing for limiting themove: ment ofthe control plate and pawl, .y 6. In a Vchain hoist, ashaft support, a 40 shaft rotatable therein, a sprocket Wheel fixed tothe shaft, a hand crank having a pawl and ratchet connection withthe'shaft for rotating the latter "in one direction, means independentof the pawl inall ,phasesv of the operationand controllable from thehand crank for. preventing reverse movement of the wheel. 1

7. In a chain hoist, the combination of a magazine having a pair ofspaced wall 'ofv able by saidinag'azine in non-entangling rechain``width spacing, and a chain' receive'.

lation for self-positioning therein independent of themagazine position.v

8. In a chain hoist, the combination of a magazine having a pair ofspaced walls of` 'chain width spacing, a chain receivable byl lsaidmagazine in non-entangling relation for .self-positioning thereinindependent of the magazine position, a pivotal support for saidmagazine eccentric of the same, and means for locking said magazine tosaid pivotal support in adjusted position.

9. In a chain hoist, a shaft support, a shaft rotatably supportedthereby, a handle, an operating element thereon, a vone-,65 way drivingco/nnectionbetween said@ ope/r-` ating element and the shaft, a singlemeans for preventing reverse rotation of the shaft with ref-:peet to thesupport andthe handle, and `releasing means independent of said one-Waydriving connection in all phases of t the operation for lreleasing saidsingle means.

10. In a chain hoist, a shaft, an operating element therefor, a pawl andratchet connec- 7,5

tion between the operating element and the wshaft, means for preventingreverse movement of the shaft, and releasing mechanism i independent ofthe paWl and controllable from the said operating element. 11. In achain hoist,l a shaft, an operating element therefor, a one-vvay drivingconnection between theshaft and the operating element for rotating the,same in one direction, means for preventing reverse movement f theshaft, said operating element having a handle member, and agrip-controlled releasing mechanism carried by said handle member' andengageable with said means -for releasing the same.

' 12v. In-a chain hoist, a shaft, a sprocket wheel fixed to the shaft,an operating element for the shaft, a one-Way driving connection betweenthe operating elementandI the shaftga locking paWl cooperableyvith the'sprocket wheel for preventing reverse rotation) of the shaft, andreleasing mechanism fonsaid locking paWl controlled from said @operatingelement independent of the position thereof.- FREDRICK W. COFFING.

